You can take a bus from Pasadena to Northridge via Lankershim / Chandler in around 2 h.
How to get from Pasadena to Northridge
From Raymond / Holly line 501 bus to Lankershim / Chandler then bus to Roscoe / Reseda. 2 h $2. From Pasadena taxi to Northridge. 30 min $175. From Pasadena drive to Northridge. 30 min $3. From Pasadena Uber to Northridge. 30 min $37.
Is there a direct bus between Pasadena and Northridge?
No, there is no direct bus from Pasadena to Northridge. However, there are services departing from Raymond / Holly and arriving at Roscoe / Reseda via Lankershim / Chandler. The journey, including transfers, takes approximately 2 h.